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17,4 PH
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Same as
|
Z3CNU 17,04
UNS S 17400
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Composition
• Cr
• Ni
• Cu
• C (max)
• Fe
|
16 - 18
3 - maxi
3 - maxi
0,06
balance
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Properties
Elastic limit Rp 0,2
Breaking limit Rm
Minimum elongation
|
Non treated
850 - 900 Mpa
950 - 1000 Mpa
8%
|
treated
1050 - 1150 Mpa
1150 - 1200 Mpa
6%
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| Minimal density |
7,7 ± 0,1 g / cm3
|
| Hardness |
250 Hv
|
350 - 400 Hv
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| Type |
Ferric
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Certainly the best choice of stainless steel, it
is also the first stainless material developed for the technology.
More over, the mechanical properties of 17.4PH can be improved with
a thermal treatment (solution treatment, deep freeze, hardening
tempering).
And finally secondary operations in order to reach tighter tolerances
are relatively easy to do.
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2% FeNi
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7% FeNi
|
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Composition
Ni
C (max)
Si (max)
Fe
|
1,5 / 2,5
0,10
0,25
balance
|
6,5 / 8
0,10
0,25
balance
|
|
Properties
Elastic limit Rp 0,2
Breaking limit Rm
Minimum elongation
|
> 100 Mpa
> 270 Mpa
25%
|
> 210 Mpa
> 410 Mpa
20%
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| Minimal density |
7,6 g / cm3
|
7,6 g / cm3
|
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Hardness
Before carbo-nitruration
After carbo-nitruration
in
surface
at
0,4 mm
|
80 -100 Hv 0,3
710 - 790 Hv 0,3
350 - 450 Hv 0,3
|
120 - 150 HV 0,3
570 - 700 Hv 0,3
350 - 450 Hv 0,3
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The choice between 2%NiFe and 7%NiFe depend of
the required hardness.
The surface treatments (Nickel plating, black oxidation, ...) are
suitable on 2%NiFe.
For higher stress resistance, 7%NiFe is better and offers higher
mechanical properties.
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